diff --git a/lang/spidermonkey170/files/patch-config_milestone.pl b/lang/spidermonkey170/files/patch-config_milestone.pl
new file mode 100644
index 000000000000..b9b1741c0f4f
--- /dev/null
+++ b/lang/spidermonkey170/files/patch-config_milestone.pl
@@ -0,0 +1,11 @@
+--- config/milestone.pl.orig	2013-02-11 22:33:22 UTC
++++ config/milestone.pl
+@@ -55,7 +55,7 @@ $MILESTONE_FILE  = "$TOPSRCDIR/config/mi
+ #
+ my $milestone = Moz::Milestone::getOfficialMilestone($MILESTONE_FILE);
+ 
+-if (defined(@TEMPLATE_FILE)) {
++if (@TEMPLATE_FILE) {
+   my $TFILE;
+ 
+   foreach $TFILE (@TEMPLATE_FILE) {